Gumball Watterson

Gumball (formerly Zach) Tristopher Watterson is the protagonist of The Amazing World of Gumball. He is a twelve-year-old, blue male cat that goes to Elmore Junior High, with his adopted brother Darwin and his four-year-old sister Anais.

Personality
Gumball is a very imaginative person. Despite his mediocre academic performance, he can be surprisingly brilliant when it comes to formulating all sorts of mischievous schemes. This side of him can be seen in episodes such as "The Plan," in which he quickly formulates a basic outline to he and his siblings plan to "save" their mother, and in "The Scam," in which he forms a crafty scheme that will allow him to cleanly heist the town's candy effortlessly. Such a side may also suggest Gumball is smarter than he lets on, as hinted by his expansive vocabulary, cooking skills, and ukulele skills as well.

Gumball is also pretty optimistic. Despite his cynicism towards society itself, as seen in episodes such as "The Bumpkin" and "The Money," he is still fairly positive in what to expect out of people (though there are exceptions). When his family is financially suffering in "The Money," he's quick to tell them of the joys of family and pushes them to be more optimistic. In "The Others," he's quick to reject Clare's notion of "no happy ending," only wanting to see her have a happy ending (no matter how forced it was). He's also happy to help others, as seen in "The Void," "The Upgrade," and "The Slide," in which in all three he went great lengths to assist Molly, Bobert, and Rocky, respectively.

In general, Gumball is very protective of his loved ones. On multiple occasions, he's quick to go into a sort of "over-protective" mode whenever anybody tries to hurt his siblings, Darwin and Anais, as seen in "The Parasite," in which he tried to nearly poison Jodie when she thought she was hurting Anais, or in "The Rerun,"in which he aimlessly tried to attack Rob out of rage when Darwin died.

Gumball has a very sarcastic nature. He's quick to diffuse all sorts of quips towards others, ranging from fairly harmless to sometimes blunt and rude. As demonstrated in episodes such as "The Stories" and "The Test," these snarky comments are impulsive.

Gumball also has a fairly massive ego, which seems to be a fault of his for no known reason.

Trivia

 * He is known to get nervous when he and the Hot Dog Guy enocunter, and they both try to avoid each other as best as possible.